Neewer Macro AF Auto Focus Extension Tube Set 13-21-31mm Blue Bayonet and Black Body for Canon DSLR SLR Camera Canon EOS 1D C, 1D X, 1D Mark I-IV, I-1Ds Mark III, 5D Mark I-III, 6D 7D 60D 50D 40D 30D 20D 10D 1100D 1000D 650D 600D 550D 500D 450D 400D 350D 300D
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